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Fossil Identification

What is that stain ?

fifbrindacier   14-10-2017 at 14:29

Normal Member
Registered: 07-12-2016
Messages: 55

Hi everybody. In my collection i have some fossils i inherited a few years ago. In those ones i have that little goniolina hexagona from the Kimmeridgian of Angoulins sur mer, in the department of Charentes-Maritimes.
I always wondered what could be that stain behind the Goniolina (behind the left side of it on the first photo).
It looks like some kind of phoronid but could also be mineral.

Regards, Sophie.

fifbrindacier   14-10-2017 at 16:39

Normal Member
Registered: 07-12-2016
Messages: 55

I must precise that the stain is about 1,5 centimeters long.

[Edited by fifbrindacier on 14-10-2017 at 16:39 GMT +1]

FossilDude   18-10-2017 at 17:09

Photo Moderator
Registered: 24-11-2007
Messages: 1443

I am sorry Sophie, I have no idea what this stain could be... These kind of things are often very difficult. Perhaps it is 'something' fossil, perhaps it is not.


Van je hobby je beroep maken.... kan het nog beter?

KoenJ   18-10-2017 at 18:03

Senior Member
Registered: 23-02-2015
Messages: 1287

Hi! I think it's a serpulid seen from below. You see it from the point where it used to be attached to the shell.

In the Dutch-Belgian cretaceous they're quite common in sea urchins, oisters and the remains of aragonitic bivalves and gastropodes.

[Bewerkt door KoenJ op 18-10-2017 om 18:04 NL]


fifbrindacier   19-10-2017 at 18:16

Normal Member
Registered: 07-12-2016
Messages: 55

I thought you might be right, my supposition of phoronid comes from that funny stain at the top of it, with those two points in the alignment of each half part of the rest of the stain (you can see some "kind" of vertical separation on it).
In fact, if you look well, it seems that the Goniolina and this are on a deteriored shell of gasteropod.


[Edited by fifbrindacier on 19-10-2017 at 18:17 GMT +1]

[Edited by fifbrindacier on 19-10-2017 at 18:18 GMT +1]